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https://issues.apache.org/jira/browse/HBASE-6346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13409820#comment-13409820
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Todd Lipcon commented on HBASE-6346:
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RH6.1+ THP defragmentation perhaps?
> Observed excessive CPU on "quiescent" cluster
> ---------------------------------------------
>
> Key: HBASE-6346
> URL: https://issues.apache.org/jira/browse/HBASE-6346
> Project: HBase
> Issue Type: Bug
> Environment: Sun JRE 6u33, Hadoop 2.0.1-alpha, HBase 0.94.1-SNAPSHOT
> Reporter: Andrew Purtell
> Attachments: graph.gif, jstack.txt, runnable_cpu_profile.png
>
>
> I've only started looking at this but became concerned when a completely
> quiescent cluster loads up 20% CPU (system+user) once HBase comes up.
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